I think that the tank is one piece, but with to lobes on the bottom?

Here's a really bad 30-second drawing:

Here's how the siphon works (I think?!): the fuel pump gets fuel from both lobes when it's working (with the direct feed on the right and also from the siphon hoses on the left lobe) but the return line is just on the right lobe. Therefore, I think that level of gas in 2-nd lobe is always a little bit higher than left lobe. I really think that if one decides to drive in circle, turning right all the time, the car will eventually run out of gas, while the left lobe actually has gas in it (I assume the pump is on the right lobe).
The reason 2 fuel senders are used: averaging the level in 2 lobes will give you an acurrate reading for the whole tank. I noticed that on my car, when the light comes on, it pretty much stays on. That tells me thay either they used some electronic trick, or the gas sender is really stable... The stable gas senders are ussualy built in a tube, but I don't see that setup here.
Just my understanding of the system, I might be wrong...